TempTrack-iOS/TempTrack/Temperature/TemperatureSensor.swift

import Foundation
import SFSafeSymbols

struct TemperatureSensor {
    
    let address: [UInt8]
    
    let value: TemperatureValue
    
    let date: Date
    
    var optionalValue: Double? {
        value.optionalValue
    }
    
    var hexAddress: String {
        String(format: "%02X %02X %02X %02X %02X %02X %02X %02X",
               address[0], address[1], address[2], address[3],
               address[4], address[5], address[6], address[7])
    }
    
    var temperatureIcon: SFSymbol {
        TemperatureSensor.temperatureIcon(optionalValue)
    }
    
    var temperatureText: String {
        value.text
    }
    
    var updateText: String {
        date.shortTimePassedText
    }
    
    static func temperatureIcon(_ temp: Double?) -> SFSymbol {
        guard let temp else {
            return .thermometerMediumSlash
        }
        guard temp > 0 else {
            return .thermometerSnowflake
        }
        guard temp > 15 else {
            return .thermometerLow
        }
        guard temp > 25 else {
            return .thermometerMedium
        }
        return .thermometerHigh
    }
}

extension TemperatureSensor {
    
    init?(address: [UInt8], valueByte: UInt8, secondsAgo: UInt16) {
        guard address.contains(where: { $0 != 0 }) else {
            // Empty address
            return nil
        }
        self.address = address
        self.value = .init(byte: valueByte)
        self.date = Date().addingTimeInterval(-TimeInterval(secondsAgo))
    }
}

extension Data {
    
    mutating func decodeSensor() throws -> TemperatureSensor? {
        guard count >= 11 else {
            throw DeviceInfoError.missingData
        }
        let address = Array(self[startIndex..<startIndex+8])
        removeFirst(8)
        let temperatureByte = removeFirst()
        let time = try decodeUInt16()
        return .init(address: address, valueByte: temperatureByte, secondsAgo: time)
    }
}